PCA9655E

Remote 16-bit I/O Expander for I2C Bus with Interrupt PCA9655E The PCA9655E provides 16 bits of General Purpose parallel Input / Output (GPIO) expansion through the I2C−bus / SMBus. The PCA9655E consists of two 8−bit Configuration (Input or Output selection); Input, Output and Polarity Inversion (active−HIGH or active−LOW operation) registers. At power on, all I/Os default to inputs. Each I/O may be configured as either input or output by writing to its corresponding I/O configuration bit. The data for each Input or Output is kept in its corresponding Input or Output register. The Polarity Inversion register may be used to invert the polarity of the read register. All registers can be read by the system master. The PCA9655E provides an open−drain interrupt output which is activated when any input state differs from its corresponding input port register state. The interrupt output is used to indicate to the system master that an input state has changed. The power−on reset sets the registers to their default values and initializes the device state machine. Three hardware pins (AD0, AD1, AD2) are used to configure the I2C−bus slave address of the device. Up to 64 devices are allowed to share the same I2C−bus / SMBus. Features  VDD Operating Range: 1.65 V to 5.5 V  SDA Sink Capability: 30 mA  5.5 V Tolerant I/Os  Polarity Inversion Register  Active LOW Interrupt Output  Low Standby Current  Noise Filter on SCL/SDA Inputs  No Glitch on Power−up  Internal Power−on Reset  ...